`a)|2x-1|=15`
`→` \(\left[ \begin{array}{l}2x-1=15\\2x-1=-15\end{array} \right.\)
`→` \(\left[ \begin{array}{l}2x=15+1\\2x=-15+1\end{array} \right.\)
`→` \(\left[ \begin{array}{l}2x=16\\2x=-14\end{array} \right.\)
`→` \(\left[ \begin{array}{l}x=8\\x=-7\end{array} \right.\)
Vậy `x∈{8;-7}`
`b)7x(2+x)-7x(x+3)=14`
`→7x(2+x-x-3)=14`
`→7x.(-1)=14`
`→7x=-14`
`→x=-2`
Vậy `x=-2`
`c)(x+2)(x-3)=0`
`→` \(\left[ \begin{array}{l}x-2=0\\x+3=0\end{array} \right.\)
`→` \(\left[ \begin{array}{l}x=2\\x=-3\end{array} \right.\)
Vậy `x∈{2;-3}`
